Others have said - buy a more expensive keyboard. That solves the complaint in the article.
Except it doesn't. 'N-key rollover' doesn't exist as a market differentiator. Unless you've gotten frustrated by this problem, decided it was actually worth your time to research it, how could you know that 'N-key rollover' is the differentiator you're looking for? The market has spoken, and 'cheap' is better than N-key rollover. Or 'good enough', anyway. It's 2009 and the writer still can't play Metroid III. I'd bet that there'll still be the same problem in 2019, even though the technical solution has existed since keyboards were invented.
Except it doesn't. 'N-key rollover' doesn't exist as a market differentiator. Unless you've gotten frustrated by this problem, decided it was actually worth your time to research it, how could you know that 'N-key rollover' is the differentiator you're looking for? The market has spoken, and 'cheap' is better than N-key rollover. Or 'good enough', anyway. It's 2009 and the writer still can't play Metroid III. I'd bet that there'll still be the same problem in 2019, even though the technical solution has existed since keyboards were invented.